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Ace knew the moment he presented as an omega, he was in trouble. Not because of the villagers or the other people of Dawn Island, not even his shitty grandpa would give him to the highest bidder, so it had nothing to do with others.
No, it had to do with his two little brothers, who were both alphas.
Once they’d presented as alphas, it was dangerous to be near Ace. Sabo and Luffy had always been strange, but once they formed the little pack with just the three of them, it was almost impossible for others to be around Ace without the younger duo trying to tear the person into two.
They had already claimed him as theirs and the fact that he was an omega now, they wanted to show everyone who Ace truly belonged to in this world.
⸻
Ace was gasping as a thick cock entered his pussy harshly, punching noises out of him each time Sabo pushed in, the blond growling ferally each time as Luffy thrusted into his mouth, hitting the back of his throat continuously.
He’d tried to run, he didn’t get far. Garp had warned him that he had his mother’s scent and fertility, overbearingly strong and able to capture the hearts and lust of any alpha and beta who smelled him. So he didn’t get far until Sabo and Luffy tracked him down in the middle of the forest.
“Ace was being a bad omega and trying to hide from his alphas,” growled Luffy, eyes hard and dark as they stared down at Ace, who whined slightly at the words. “You don’t get to cry now, not when we have you and you get to enjoy our cocks.”
“That’s right, precious.” Sabo purred behind him, laying his chest flat on his back, his hands moving to cup Ace’s small breast. “Just let us help you through this. You tried to run from us, but deep down you know you’re ours. No one else can love you like we do, no one else will love you like we do.”
“After all,” started Luffy above him and Ace turned his watery eyes to his beloved little brother, who stared back down with all the disdain he could. “You’re Gol D. Roger's son, the son of a demon.”
Those words break him. Ace can’t help but start to fall into a deep pit of darkness. His greatest fear, thrown out there. Nobody would love the son of a demon! His inner omega cries out in desperation and despair as he sobs messily around the still thrusting cock as both Luffy and Sabo’s alphas start rumbling to calm as the smell of distressed omega starts to overpower his sweet smoking wood scent, making his omega cry out back for them.
“Don’t worry sweetie,” Sabo murmured lovingly as he continued to use his pussy harshly, his knot starting to swell. “We’ll always love you. That’s why we’re going to claim you and breed you so well. You’ll be full of our pups and we’ll take care of you, you won’t have to worry about being alone.”
A muffled keen is his only response, gray eyes distant from the despair he felt in that moment before Luffy removed himself from his mouth, roughly gripping his chin and tilting his head back, forcing him to meet his eyes. “We love you, omega and we’ll show you that.” Ace was dimly aware of Sabo shifting him so he sat on the taller blond’s lap, back flush against the others chest as he heaved desperately, trying to listen to the slight nagging in the back and over his omega’s wails about being alone and needing them so desperately. “But we have to mark you for you to understand.”
Then blinding pain before his omega began to quiet down at long last. A bond forming on both ends of his neck, Luffy and Sabo’s alpha fangs sunken deep into his skin…He keened pitifully, his omega wanting to return the favor.
Sabo shifted him slightly in order for him to bite his own neck, to which he quickly did so, getting lost in his instincts to mate, to not be alone before it was Luffy’s turn, both barely wincing as his omega fangs pierced their skin, solidifying the bond.
The trio sat there for a moment, waiting for the bond to finish on Ace’s side before they repositioned him back onto all fours, Sabo’s cock back to thrusting into him and Luffy’s back in his mouth and the only thing going through Ace’s mind was pleasing the duo, making sure he did good so they didn’t leave him.
“Our precious sweet girl,” growled Sabo as he finally pushed his knot inside of Ace, expanding and locking them together as he came inside, flooding him with fertile seed. “Don’t worry darling, you’ll get pregnant. We’ll make sure by the end of this heat, you’ll have a whole healthy litter.”
Ace whined as Luffy’s knot began to expand in his mouth as well, forcing his jaw to almost unhinge as it pushed deeper and deeper, his knot locking behind his teeth, his thick length deep in the freckled teens throat and sending his release straight down Ace’s throat with only minor choking.
“Good girl, just for us.” Luffy agreed, running his fingers through Ace’s messy, dirty hair.
Ace just sat there, praying they would never leave him. He was theirs now and he wouldn’t be able to handle losing either one of them…even as they filled him to the brim, his stomach and throat expanding a bit with each burst of cum and most likely bred him.